Dynamic watermarks with GD can it be done?

[cooldude832]

I'm trying to create a dynamic watermark of my images based on which user owns the image (the site is a image upload/sharing site)

I want to create a semi obaque watermark with the sitename:created by: Username

Any ideas how to do it without doing a text write and without having to create a crazy system of writing my own characters/font face

[lightningstrike]

Yes I believe it can be done.

 

header('Content-Type: image/jpeg');  
$wm = imagecreatefromjpeg('watermark.jpg');
//get dimensions
$h = imagesy($wm);
$w = imagesx($wm);
//load image to be watermarked
$image = imagecreatefromjpeg('image.jpg');
$offset = 10;
$x = imagesx($image) - ($w+$offset);
$y = imagesy($image) - ($h+$offset);
//merges them
imagecopymerge($image, $wm, $x, $y, 0, 0, $w, $h, 100);
imagejpeg($image);
//clear memory
imagedestroy($image);
imagedestroy($wm);

 

Not sure if that works too well, haven't tested it out. But a little fiddling around should make it alright.

[cooldude832]

yes i know that to apply it, but i want to make it dynamic and not a font

[lightningstrike]

Ahh I see.

 

Sorry can't help you out. There is no simple way of doing it without writing text, I believe.

[cooldude832]

yeah i'll have to write a GD program that writes a string as an image (using lines and shapes) but anyone know how to draw opaque layers?